求积元梁单元在钢混桥梁抗震分析中的应用

Seismic analysis of steel-concrete bridges with weak formquadrature beam element

弱形式求积元法已经在各种结构的非线性分析中展现了高效准确的优点。本文基于KentPark混凝土本构模型和Légeron钢筋本构模型,对潮连互通主线高架桥主梁在地震作用下的弹性和弹塑性变形进行了弱形式求积元分析。并与现有桥梁设计应用最为广泛的MIDAS/Civil软件的分析结果进行了对比,证实了求积元梁单元的可靠和有效性。采用求积元梁单元分析钢筋混凝土结构可以在不降低计算精度的基础上,显著减少整体模型的单元数量和求解结构平衡方程的矩阵阶数,降低问题的求解规模。本文探讨了求积元梁单元在桥梁抗震分析上的应用前景。

The weak-form quadrature element method( QEM) has exhibited its high computational efficiency and accuracy in nonlinear analysis of various structures. With Légeron model for rebars and Kent-Park model for concrete,seismic analysis of the girder of Chaolian steel-concrete interflow viaduct is performed using quadrature beam elements. The reliability and effectiveness of the element are validated and comparison with results of MIDAS / Civil is made. The QEM can significantly decrease the number of elements of the entire model,and reduce the order of equilibrium equation matrix. The prospect of the weak-form quadrature beam element in seismic analysis of bridges is discussed.